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Spin freezing in the van der Waals material Mn2Ga2S5 |
| Jie Shen(沈洁)1,2, Xitong Xu(许锡童)1, Miao He(何苗)1,2, Yonglai Liu(刘永来)1,2, Yuyan Han(韩玉岩)1,2, and Zhe Qu(屈哲)1,2,† |
1 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions, CAS Key Laboratory of Photovoltaic and Energy Conservation Materials, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China;
2 Science Island Branch of Graduate School, University of Science and Technology of China, Hefei 230026, China |
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Abstract Geometrical frustration in low-dimensional magnetic systems has been an intriguing research aspect, where the suppression of conventional magnetic order may lead to exotic ground states such as spin glass or spin liquid. In this work we report the synthesis and magnetism study of the monocrystalline Mn$_2$Ga$_2$S$_5$, featuring both the van der Waals structure and a bilayered triangular Mn lattice. Magnetic susceptibility reveals a significant antiferromagnetic interaction with a Curie-Weiss temperature $\theta_{\rm w}\sim-260$ K and a high spin $S=5/2$ Mn$^{2+}$ state. However, no long range magnetic order has been found down to 2 K, and a spin freezing transition is found to occur at around 12 K well below its $\theta_{\rm w}$. This yields a frustration index of $f = -\theta_{\rm w}/T_{\rm f} \approx 22$, an indication that the system is highly frustrated. The absence of a double-peak structure in magnetic specific heat compared with the $TM_2$S$_4$ compounds implies that the spin freezing behavior in Mn$_2$Ga$_2$S$_5$ is a result of the competition between exchange interactions and the 2D crystalline structure. Our results suggest that the layered Mn$_2$Ga$_2$S$_5$ would be an excellent candidate for investigating the physics of 2D magnetism and spin disordered state.
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Received: 16 March 2022
Revised: 23 March 2022
Accepted manuscript online: 08 April 2022
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PACS:
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71.20.Nr
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(Semiconductor compounds)
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75.50.-y
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(Studies of specific magnetic materials)
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75.50.Lk
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(Spin glasses and other random magnets)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. U1832214, 11774007, U2032213, and 12104461). |
Corresponding Authors:
Zhe Qu
E-mail: zhequ@hmfl.ac.cn
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Cite this article:
Jie Shen(沈洁), Xitong Xu(许锡童), Miao He(何苗), Yonglai Liu(刘永来), Yuyan Han(韩玉岩), and Zhe Qu(屈哲) Spin freezing in the van der Waals material Mn2Ga2S5 2022 Chin. Phys. B 31 067105
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